mirror of
https://git.postgresql.org/git/postgresql.git
synced 2024-12-27 08:39:28 +08:00
b120382353
- Change configure.in to use Autoconf 2.61 and update generated files. - Update build system and documentation to support now directory variables offered by Autoconf 2.61. - Replace usages of PGAC_CHECK_ALIGNOF by AC_CHECK_ALIGNOF, now available in Autoconf 2.61. - Drop our patched version of AC_C_INLINE, as Autoconf now has the change.
113 lines
3.4 KiB
Plaintext
113 lines
3.4 KiB
Plaintext
# Macros to detect C compiler features
|
|
# $PostgreSQL: pgsql/config/c-compiler.m4,v 1.15 2008/02/17 16:36:42 petere Exp $
|
|
|
|
|
|
# PGAC_C_SIGNED
|
|
# -------------
|
|
# Check if the C compiler understands signed types.
|
|
AC_DEFUN([PGAC_C_SIGNED],
|
|
[AC_CACHE_CHECK(for signed types, pgac_cv_c_signed,
|
|
[AC_TRY_COMPILE([],
|
|
[signed char c; signed short s; signed int i;],
|
|
[pgac_cv_c_signed=yes],
|
|
[pgac_cv_c_signed=no])])
|
|
if test x"$pgac_cv_c_signed" = xno ; then
|
|
AC_DEFINE(signed,, [Define to empty if the C compiler does not understand signed types.])
|
|
fi])# PGAC_C_SIGNED
|
|
|
|
|
|
|
|
# PGAC_TYPE_64BIT_INT(TYPE)
|
|
# -------------------------
|
|
# Check if TYPE is a working 64 bit integer type. Set HAVE_TYPE_64 to
|
|
# yes or no respectively, and define HAVE_TYPE_64 if yes.
|
|
AC_DEFUN([PGAC_TYPE_64BIT_INT],
|
|
[define([Ac_define], [translit([have_$1_64], [a-z *], [A-Z_P])])dnl
|
|
define([Ac_cachevar], [translit([pgac_cv_type_$1_64], [ *], [_p])])dnl
|
|
AC_CACHE_CHECK([whether $1 is 64 bits], [Ac_cachevar],
|
|
[AC_TRY_RUN(
|
|
[typedef $1 ac_int64;
|
|
|
|
/*
|
|
* These are globals to discourage the compiler from folding all the
|
|
* arithmetic tests down to compile-time constants.
|
|
*/
|
|
ac_int64 a = 20000001;
|
|
ac_int64 b = 40000005;
|
|
|
|
int does_int64_work()
|
|
{
|
|
ac_int64 c,d;
|
|
|
|
if (sizeof(ac_int64) != 8)
|
|
return 0; /* definitely not the right size */
|
|
|
|
/* Do perfunctory checks to see if 64-bit arithmetic seems to work */
|
|
c = a * b;
|
|
d = (c + b) / b;
|
|
if (d != a+1)
|
|
return 0;
|
|
return 1;
|
|
}
|
|
main() {
|
|
exit(! does_int64_work());
|
|
}],
|
|
[Ac_cachevar=yes],
|
|
[Ac_cachevar=no],
|
|
[# If cross-compiling, check the size reported by the compiler and
|
|
# trust that the arithmetic works.
|
|
AC_COMPILE_IFELSE([AC_LANG_BOOL_COMPILE_TRY([], [sizeof($1) == 8])],
|
|
Ac_cachevar=yes,
|
|
Ac_cachevar=no)])])
|
|
|
|
Ac_define=$Ac_cachevar
|
|
if test x"$Ac_cachevar" = xyes ; then
|
|
AC_DEFINE(Ac_define,, [Define to 1 if `]$1[' works and is 64 bits.])
|
|
fi
|
|
undefine([Ac_define])dnl
|
|
undefine([Ac_cachevar])dnl
|
|
])# PGAC_TYPE_64BIT_INT
|
|
|
|
|
|
|
|
# PGAC_C_FUNCNAME_SUPPORT
|
|
# -----------------------
|
|
# Check if the C compiler understands __func__ (C99) or __FUNCTION__ (gcc).
|
|
# Define HAVE_FUNCNAME__FUNC or HAVE_FUNCNAME__FUNCTION accordingly.
|
|
AC_DEFUN([PGAC_C_FUNCNAME_SUPPORT],
|
|
[AC_CACHE_CHECK(for __func__, pgac_cv_funcname_func_support,
|
|
[AC_TRY_COMPILE([#include <stdio.h>],
|
|
[printf("%s\n", __func__);],
|
|
[pgac_cv_funcname_func_support=yes],
|
|
[pgac_cv_funcname_func_support=no])])
|
|
if test x"$pgac_cv_funcname_func_support" = xyes ; then
|
|
AC_DEFINE(HAVE_FUNCNAME__FUNC, 1,
|
|
[Define to 1 if your compiler understands __func__.])
|
|
else
|
|
AC_CACHE_CHECK(for __FUNCTION__, pgac_cv_funcname_function_support,
|
|
[AC_TRY_COMPILE([#include <stdio.h>],
|
|
[printf("%s\n", __FUNCTION__);],
|
|
[pgac_cv_funcname_function_support=yes],
|
|
[pgac_cv_funcname_function_support=no])])
|
|
if test x"$pgac_cv_funcname_function_support" = xyes ; then
|
|
AC_DEFINE(HAVE_FUNCNAME__FUNCTION, 1,
|
|
[Define to 1 if your compiler understands __FUNCTION__.])
|
|
fi
|
|
fi])# PGAC_C_FUNCNAME_SUPPORT
|
|
|
|
|
|
|
|
# PGAC_PROG_CC_CFLAGS_OPT
|
|
# -----------------------
|
|
# Given a string, check if the compiler supports the string as a
|
|
# command-line option. If it does, add the string to CFLAGS.
|
|
AC_DEFUN([PGAC_PROG_CC_CFLAGS_OPT],
|
|
[AC_MSG_CHECKING([if $CC supports $1])
|
|
pgac_save_CFLAGS=$CFLAGS
|
|
CFLAGS="$pgac_save_CFLAGS $1"
|
|
_AC_COMPILE_IFELSE([AC_LANG_PROGRAM()],
|
|
AC_MSG_RESULT(yes),
|
|
[CFLAGS="$pgac_save_CFLAGS"
|
|
AC_MSG_RESULT(no)])
|
|
])# PGAC_PROG_CC_CFLAGS_OPT
|